Pith Number

pith:BEU5UXX6

pith:2009:BEU5UXX6JIK2G5OYPE5II3KYOP

not attested not anchored not stored refs pending

A non-local area preserving curve flow

Liang Cheng, Li Ma

arxiv:0907.1430 v2 · 2009-07-09 · math.DG · math.AP

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BEU5UXX6JIK2G5OYPE5II3KYOP}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T03:39:51.231084Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0929da5efe4a15a375d8793a846d5873dd1000420fbee01f2f35dddc50a602d6

Aliases

arxiv: 0907.1430 · arxiv_version: 0907.1430v2 · doi: 10.48550/arxiv.0907.1430 · pith_short_12: BEU5UXX6JIK2 · pith_short_16: BEU5UXX6JIK2G5OY · pith_short_8: BEU5UXX6

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/BEU5UXX6JIK2G5OYPE5II3KYOP \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 0929da5efe4a15a375d8793a846d5873dd1000420fbee01f2f35dddc50a602d6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e36a92e4449e52147882506876099c8ebeb635dfe72fb0df2dba1bbf6862ddeb",
    "cross_cats_sorted": [
      "math.AP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2009-07-09T07:37:00Z",
    "title_canon_sha256": "9c5e551b788b62370862fc21e610d88e4b3f91bde4458b23ca052f0df6c155cf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.1430",
    "kind": "arxiv",
    "version": 2
  }
}